12663521121321 has 12 divisors (see below), whose sum is σ = 20904860263872. Its totient is φ = 7236297783576.

The previous prime is 12663521121301. The next prime is 12663521121347. The reversal of 12663521121321 is 12312112536621.

12663521121321 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 3 + 521 + 121 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 12663521121321 - 2⁶ = 12663521121257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12663521121301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100504135821 + ... + 100504135946.

It is an arithmetic number, because the mean of its divisors is an integer number (1742071688656).

Almost surely, 2^{12663521121321} is an apocalyptic number.

It is an amenable number.

12663521121321 is a deficient number, since it is larger than the sum of its proper divisors (8241339142551).

12663521121321 is a wasteful number, since it uses less digits than its factorization.

12663521121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201008271780 (or 201008271777 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

Adding to 12663521121321 its reverse (12312112536621), we get a palindrome (24975633657942).

The spelling of 12663521121321 in words is "twelve trillion, six hundred sixty-three billion, five hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty-one".